Spring-scale



(No Model.)

F. KINGWILL.

" sPmNGfA SCALE.

Patented Aug. 7, 1883.

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4o jections or rests b brfor the -..UNITED STATES "PATENT FFIOE.

JOHN F. KINGWILL, OF CHICAGO, rLLINoIs.l

SPRING-SCALE.

SPECIFICATION forming part of Letters To all whom it may concern.-

Be it known that I, JOHN F. KINGWILL, a citizen of the United States of America, residing at Chicago, inthe county of Cook and State of Illinois, haveinvented certain new and useful Improvements in Spring-Scales, of which the following, in connection with the accompanying drawings, is a specification.

In the drawings, Figure l is a side view of a spring-scale embodying my invention. Fig. 2 is a section in the plane of the line :l: a" of Fig. l. Fig. 3 is a top View of the scale. Fig. 4 is detail showing the manner of joining the back plate and the beam-guide. Fig. 5 is a front view of the parts shown in Fig. 4. Fig. 6 is a section in the plane of the line y y of Fig. 5, and Fig. 7 is a section in the plane of the linez z of Fig. 2.

Like letters of reference indicate like parts.

A represents a wall-plate, in the upper end of which is a hole or opening, a, to adapt the said plate to be hung upon a hook, screw, or other suitable support for suspending the scale in any convenient place. In the central part of the plate A are small openings a a', and a a are arched or bow-shaped projections extending forward over the openings a a. rI`he openings a (dare not essential, but only a mere incident in the mode of casting eyes for the reception of the ends of the spring, as will hereinafter more fully appear, the said eyes being cast in the example shown by what is known among moulders as the process of coping.77 In the upper and lower parts of the plate A are lugs a a, also cast thereon by coping, and constituting dovetail sockets for the reception of the ends of the scale-beam guide, as will hereinafter be more fully eX- plained. Below the parts a a are small proends of the spring above referred to, and b b are downwardlycurved fingers projecting forward from the central part of the wall-plate.

B is a centrally bent and coiled spring, the lower parts of which enter the eyes formed by the arches af a. The ends of this spring rest upon the rests I) b. I bend this spring centrally to form a horizontal arm, c, and between this horizontal arm and the ends of the spring are the coils c c.

It will be perceived that a downward press- Patent No. 282,645, dated ugust 7, 1883. Application filed March 31, 1853. (No model.)

ure on the arm c will be yieldingly resisted by the coils e c', which are the more tightly or closely wound or coiled by this pressure, instead of being spread or opened thereby. In other words, the action is different from that of a close coilsuspending a weight.

C is the scale-beam, the rear end of which `bears against the lingers b b, and which is suspended from the arm c by means of ahook, d, as is clearly shown in Figs. l and 2. I desire to state, however, that it is not essential to my invention that the beam C should be linked to the arm c,- but it may berigidly attached thereto, in which case it need not bear against the arms Z/ b.

l Dis an index-hand or the beam C.. In practice I prefer to pivot hand or pointer D to its'beam, for the purpose hereinafter set forth.

' In the forward or free end of the beam C, I make a number of holes, e e.

E is a dish or hopper suspended from the forward end of the beam C.

F is the'beam-guide, the rear ends of which are adapted to sit fittingly between the lugs a a, which support the said guide removabl y. Applied to the forward part of the guide F is a graduated plate, G, between which and the guide the beam C is arranged and allowed tovibrate freely up and down. The hand D is at the zero point or character when the scale is balanced and the dish or hopper I] con-v tains nothing to be weighed; but if the said dish contains anything, the beam C and its hand will move downward and indicate the weight of thecontents of the dish.

II is a supplemental close spiral spring eonnected to the upper arm of the guide F and to the beam C. I employ the spring H, which is a much lighter and more delicate spring than the spring B, for the purpose of causing the index-hand to indicate ounces instead of pointer applied to pounds, the `beam C being disconnected fronr the spring B when the spring II is employed 5 but the spring HV has no necessary connection with the other features of my invention, eX- cepting when employed as described.

It may sometimes occur in practice that the yielding quality of different springs BB will vary, so that the index-hand, when operating in connection with one yof the said springs, will IOO -2 remit not stand .in the same relation tothe graduat ed scale as when operating in connection with another. In other Words, a change of beamsupportiug springs may eause the seale to indieate erroneously; aud to compensate vl'or this variation I east several holes, e e, in the torward end of the beam, so that, .in testing, the length of lever adapted to that partieular spring may be obtained without the neeessity of marking and drilling eaeh beam, thereby saving a great amount of labor.

After the various parts of the seale have been arranged together for use a pointer rigidlyattaehed to the beam would rarely point exaetly to zero. I therefore attach the pointer :uljustably to the beam, but i'rmly enough not to be subjeet to aeeidental displaeement.

Having thus described .my invention, what l elaim as new, and desire to seeure by Letters Patent, is-

l. The eombiuaton,in a spring-seale, ol' the wall-plate A, the eentrally vbent and eoiled spring B, havinga horizontal arm, e, the sealebeam C, linked between its ends to the arm e, and bearing at its rear end against the plate A, the beam-guide F, the graduated plate (el,

and the index-hand D, pivoted to the beam C, all arranged substantially as described in relation to eaeh other, and for the purposes set Yl'orth.

2. rllhe combination, in a spring-seale,o't` the wall-plate A, the Centrally bent and eoiled spring B, havinga horizontal arm, e, the sealebeam C, having in its forward end the holes e e, and linked between its ends to the arm 0, and bearing at its rear end against the uallplate A, the detachable beam-guide l?, the graduater'l plate G, and the index-hand 1), piv oted to the beam C, all arranged substantially as deseribed in relation to eaeh other, and ll'or the purposes set forth.

8. The combination, ina springseale, of the Wall-plate A, the centrally bent and eoiled spring l5, the su] plemental spring ll, the beam-guide l?, the graduated plate G the seale beam Ll, and the index-hand l), pivoted tothe said beam, all arranged substautiall y as shown and deseribed, and for the purposes set l'orth.

JOHN l?. l( ING W llil'i.

Vitnesses:

F. F. XVAnNina, (l. l. llurrnNNY. 

